package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;

import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_CODE_KEY;
import static com.hmdp.utils.SystemConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        // 1. 校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号码格式错误！");
        };
        // 2. 生成验证码
        String code = RandomUtil.randomNumbers(6);
        // 3. 保存验证码到session
        session.setAttribute(CODE_SESSION_KEY, code);

        // 3. 保存验证码到redis
//        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, 2L, TimeUnit.MINUTES);

        // 4. 发送验证码
        log.debug("发送手机验证码：{}", code);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 1. 校验手机号和验证码
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号码格式错误！");
        };
        // 2. 校验验证码是否正确
        String code = loginForm.getCode();
        String cachedCode = (String)session.getAttribute(CODE_SESSION_KEY);
        if (code == null || !code.equals(cachedCode)) {
            return Result.fail("验证码错误！");
        }
        // 3. 根据手机号查询用户信息
        // 为什么我下面注释掉的三行代码会报错呢？
//        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
//        queryWrapper.eq(User::getPhone, phone);
//        User user = getOne(queryWrapper);
        User user = query().eq("phone", phone).one();
        // 4. 用户不存在则创建用户
        if (user == null) {
            user = createUserWithPhone(phone);
        }
        // 5. 保存用户信息到session
        session.setAttribute(USER_SESSION_KEY, BeanUtil.copyProperties(user, UserDTO.class));
        return Result.ok();
    }

    // 创建用户
    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        save(user);
        return user;
    }

}
